Mass-separation of impurities in the ion beam systems with reversed magnetic beam focusing

This paper describes the intrinsic capability of ion systems with reversed magnetic beam focusing for impurities mass-separation. Numerical calculation of the ion trajectory deviation with taking into account the experimental ion energy distribution function for hydrogen-oxygen gas mixture was carried out. It is demonstrated that O+ impurities which are present in the beam are separated and form the circle with a diameter of ∼6 mm. Therefore, the central part of the spot is free of impurities due to magnetic separation. As a result, the source generates steady-state hydrogen ion beam, which irradiates the surface with high heat and particle fluxes, which approach the upper limit for the flux range expected in a fusion reactor.